Investigation of a Branchlike MoO₃/Polypyrrole Hybrid with Enhanced Electrochemical Performance Used as an Electrode in Supercapacitors

Abstract

A branchlike MoO3/polypyrrole conductive nanocomposite was facilely prepared by wrapping a homogeneous polypyrrole (PPy) layer around MoO3 nanobelts via the in situ oxidative polymerization of a self-assembled pyrrole monomer. X-ray powder diffraction characterization demonstrated that the PPy polymer does not hinder the crystallization of the MoO3 nanobelts substrate. The electrochemical tests show that the specific capacitance of 129 F g(-1) for the MoO3/PPy hybrid is higher than both pristine MoO3 and pure PPy. Moreover, the hybrid electrode with good electrical conductivity displays good cyclic stability of 90% retention after 200 cycles of charge/discharge. These results indicate a promising potential application of the MoO3/PPy nanocomposite for use as an effective electrode material in supercapacitors.

Emerging Energy Applications of Two-Dimensional Layered Materials

“…Furthermore, the sub-nanometer level thickness of the exfoliated 2D nanosheets makes possible an optimization of the power density of 2D nanosheet-based hybrid materials via a strong electronic coupling with hybridized conductive materials. [188][189][190][191][192][193][194][195][196][197] Because of the unique microstructure with combination of two 2D materials and having high surface area due to their novel crystal structure, TMDCs/graphene hybrids have a potential to significantly enhance the electrochemical performance as supercapacitor electrodes 193,[198][199][200] . The success of applying a homo or heterogeneous nanostructured hybrid materials for supercapacitors, strongly depends on the factors such as: employment of proper synthesis methods to prepare the desired nanostructure; selection of a proper combination of different materials; designation and optimization of the heterogeneous nanostructure 193,[198][199][200] .…”

Recent Progress on Molybdenum Oxides for Rechargeable Batteries

“…It is assumed that we can further revolutionize battery systems by synthesizing innovative materials throught he field of nanochemistry. [26,27] To date, developments in currentM oO 3 -based batteries are limited by the low coulombic efficiency in the initial cycles, unstable cycling properties, low rate capability because of the irreversible conversion mechanism,l ack of structural sta-Diminishing fossil-fuelr esources and ar ise in energy demands has required the pursuit of sustainable and rechargeable energy-storagem aterials, including batteries and supercapacitors, the electrochemical properties of which dependl argely on the electrode materials. [9][10][11][12][13][14][15][16][17] Transition-metal oxidesh ave been extensivelyc onsidered because they have great volumetric and gravimetric capacities, compared with those of carbon-based materials.…”

Self-templating Scheme for the Synthesis of Nanostructured Transition-Metal Chalcogenide Electrodes for Capacitive Energy Storage

“…1,[7][8][9] Previously developed pseudocapacitors have been based on transition metal oxides, hydroxides and conducting polymers which invariably suffer from either low conductivity or poor electrochemical stability, largely limiting their applications. [10][11][12][13][14] Therefore, it is imperative to create alternative pseudocapacitive materials with low cost, desirable electrical conductivity, highly porous structure, high specific surface area, desirable ionic permeability, large capacitance and good electrochemical stability. 15,16 Due to their unique structural features including well-defined interior voids, low density, low coefficients of thermal expansion, large surface area and surface permeability, hollow micro/nanostructured binary transition metal sulfides such as nickel sulfide and cobalt sulfide 3 have been widely investigated as a new class of pseudocapacitive electrode materials.…”